ADI's integrated VCO PLL frequency synthesizer improves base station performance and wireless service quality

China, Beijing-Analog Devices, Inc., the world's leading provider of high-performance signal processing solutions, recently introduced a phase-locked loop (PLL) frequency synthesizer ADF4355 with integrated voltage-controlled oscillator (VCO), mobile network operator It can be used to improve cellular base station performance and wireless service quality. The new PLL frequency synthesizer ADF4355 with integrated VCO operates at frequencies up to 6.8 GHz, which provides considerable margin for the industry's current carrier frequency. Designed for cellular base stations, wireless service providers can take advantage of the high operating frequency and low VCO phase noise of this new PLL frequency synthesizer to increase call throughput and handset signal coverage, enabling each base station to serve more users. The cost has not increased significantly. For manufacturers of point-to-point/point-to-multipoint microwave links, satellite/VSAT systems, industrial and test and measurement systems, and other wireless devices, the device's high frequency band also increases its throughput.

In frequency-generating applications in the wireless and industrial fields, VCO phase noise performance plays a key role in determining the overall system performance of RF signal transmission and reception. Choosing the right PLL frequency synthesizer for the RF local oscillator (LO) is important for system design. consider. ADI's ADF4355 wideband PLLVCO frequency synthesizer fully meets the stringent requirements of VCO phase noise for frequency generation applications, is competitive in cost, can replace other PLL devices, and its 5mm & TImes; 5mm LFCSP package is the smallest of its kind. The combination of these features allows designers to ensure that phase noise is as low as possible, expands the frequency range, reduces the size, and extends the operating temperature range to reduce risk.

The integrated VCO of the ADF4355 PLL Synthesizer has an output frequency range of 3.4 GHz to 6.8 GHz. The VCO frequency can be divided by 1, 2, 4, 8, 16, 32 or 64, so designers can generate RF output frequencies as low as 54 MHz, which allows the ADF4355 to cover continuous frequencies from 54 MHz to 6800 MHz without gaps. range. For applications that require isolated noise, the RF output stage has a mute function that can be muted by pin and software control. The ADF4355 can operate in fractional-N or integer-N mode with 38-bit analog-to-digital resolution for precise frequency operation independent of the reference input frequency.

All on-chip registers are controlled through a simple three-wire interface. The ADF4355 operates from 3.15 V to 3.45 V analog and digital supplies with a 4.75 V to 5.25 V charge pump and VCO supply. In addition, the ADF4355 has built-in hardware and software power saving modes.

Main features of ADF4355 wideband, ultra low noise frequency synthesizer

· 54 MHz to 6.8 GHz continuous frequency range

· Ultra-low VCO phase noise: -144dBc/Hz (1 MHz offset, typical at 1.7 GHz)

· High resolution 38-bit modulus

· Operating temperature range: -40C to +85C, no need to reprogram

· Dual differential output

· Support ADIsimPLL circuit design and virtual evaluation software

· Integral rms jitter: about 150fs

About Analog Devices

Analog Devices, Inc. (ADI) is committed to designing and manufacturing advanced semiconductor products and superior solutions, helping customers with outstanding sensing, measurement and connectivity technologies to build intelligent bridges that connect the real world and the digital world. Re-recognize the world around you.

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